Kraft, a former athlete, needed a supportive shoe

Kraft's passion for football — and for the Patriots organization specifically — began in his youth. After playing running back at Columbia University, Kraft, based in Massachusetts, was a 23-year New England Patriots season ticket holder before buying the team.

Kraft bought the Patriots in 1994, and it was the first year the team made the playoffs in eight seasons. Since then, the team has had 20 winning seasons, 16 division titles, eight conference championships, and five Super Bowl wins.

An endorsement deal arose from wearing Nikes

Often Kraft would show up to games and events in different versions of Nike's Air Force 1s, including a custom bedazzled red, white, and blue version like the ones he sported during a game against the New York Jets in 2014.

"I got Mark Parker, who's the CEO of Nike, to come and speak at an event in Boston," Kraft told Bloomberg. "And he was amazed to see me wearing them. I had a suit on, and I was wearing Air Force 1s."

In 2014, Nike released its first version of the Patriots-inspired Lunar Force 1, and the pair sold out in less than 10 minutes, CBS Sports reported.

Kraft's update of Nike's signature Air Force 1 sneaker featured the Patriots logo and his initials, "R.K.K."

Robert Kraft, right, sporting a pair of Nikes. Elsa/Getty Images

The Kraft-Nike collab sneaker sells for around $140, when available, and all proceeds from the shoes fund fitness programs at the Boys and Girls Clubs of Boston, whose CEO is none other than Kraft's son, Josh Kraft.

In 2017, the billionaire's shoe got a sleek redesign to reflect the team's fifth Superbowl win earlier that year. The Air Force 1 Ultra Flyknit Low RKK came with five pairs of removable Velcro patches — one for each Patriots championship up to that point — and a note from Kraft reminding the purchaser of the charitable mission of the shoe deal.

"I'm comfortable, get a little street cred, and get some money for a great charity," Kraft told Bloomberg of the shoe.

Kraft in his Air Force 1 Ultra Flyknit Low RKKs at the AFC Divisional Playoff game against the Tennessee Titans in January 2018. Jim Rogash/Getty Images

Earlier this year, Kraft was photographed wearing his Nikes to New York City's exclusive Met Gala, People reported. He's also worn the special kicks to the Academy Awards and the Grammys, according to the Boston Globe.

The shoes inspired another Nike-Patriot collaboration

After the success of the shoe collab with the team's owner, Nike issued a Patriot-Nike edition of the Air Force 1s in 2017 to commemorate New England's 25-point Super Bowl comeback against the Atlanta Falcons.

The one-of-a-kind Air Force 1 Low SB51 Comeback sneakers were made from two footballs (including laces) used in Super Bowl LI. The single pair was auctioned off, and profits went to the Boys and Girls Club of Boston.